Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de3c19262c1c3a6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 19:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8109ddbe5458d187879831bb2641ca00 SHA-1: a70443fce7a0e17ce09e54bfed5d0396479d8496 SHA-256: 6de3c19262c1c3a6144f63487c09b3c21169caa58066b0c984783b7da0dd7932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=mumu+app+player+old+version PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf1a7dde---45417371377.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lujusirisajedomigexafuna.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/dutitulisivo.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/fekodiguzewenuvefit.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210916012712.pdfIn PDF document text
    • http://otczenacts.com/media/files/kivemutozasobegatugil.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/76349267653.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/vozunasawezerixuxon.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/godosetanajoj.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xusumuniru.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/47913208355.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/24051121818.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd544194e---38833730851.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/detalabusaj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9304e54f---7153133005.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/guwuxugefugobinu.pdfIn PDF document text
    • https://bloc-immo.com/images/juzupivudujolapale.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/napurufufazifibazijerelaw.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/3098847209.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/9675801501.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/gemet.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/fupavaxebusa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10728 bytes
SHA-256: e6781de1c18fd931f573841808efa0ae041e62f9475f17cd396bacaa41487bd4
font_02_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 18280 bytes
SHA-256: c9f1bc6dc9df045d42ffe196f3530037f8a2a24ab633e0e1dba8be4b135d700e